I'm bumping this thread, partly to see if anyone has any thoughts about Manwich Valley, and partly to register my bemusement over a Dr. Seuss cookbook.
An obvious item in a Dr. Seuss cookbook would be green eggs and ham, either from green-shelled eggs such as those of the quail or the Araucana hen, or from eggs whose insides have been colored green. A book of techniques (Jacques Pépin? James Peterson?) gives instructions for extracting the green color from spinach. In any case the green eggs can come from RL birds, including "just a common old hen."
The other foods I remember without thinking (other than the ham served with the green eggs) are the eggs or meat of imaginary birds: Scrambled Eggs Super, or the Nizzards fed to Lord Droon in The King's Stilts.
On second thought, there's the Truffula fruit in The Lorax, the bread and butter fought over in The Butter Battle Book, and the Who hash and roast beast that had something to do with the Grinch.
Anyone remember any other foods in the works of Dr. Seuss? And what's really in the Dr. Seuss cookbook?